This website uses cookies to improve your experience. You consent to our cookies if you continue to use this website. I Agree Read more
>> 123 file

123 file format description

Many people share .123 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .123 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .123 files.

1 filename extension(s) found in our database.

.123 - Lotus 123 Spreadsheet

123 file is a Lotus 1-2-3 Spreadsheet. Lotus 1-2-3 is a spreadsheet program designed for IBM-compatible personal computers by Lotus Corporation in 1982.

.123 file format description:
123 format
Lotus 1-2-3
Document files
- / -
wk1, wk2, wk3, wks
Lotus 123 Spreadsheet related links:
Microsoft Office Excel
Lotus 123 Spreadsheet related extensions:
Lotus 1-2-3 V2 Spreadsheet
Lotus 1-2-3 Worksheet Formatting Data
Lotus 1-2-3 Data File
Lotus 1-2-3 for Japan Document
Lotus 1-2-3 Worksheet
Lotus 1-2-3 Smartmaster Template

Naturally, other applications may also use the .123 file extension. Even harmful programs can create .123 files. Be especially cautious with .123 files coming from an unknown source!

Can't open a .123 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

If you find the information on this page useful, please feel free to link to this page.

If you have useful information about the .123 file format, then write to us!